My Shuffle experience has been mostly negative. I've found most of the guys can't drive on harder tires and most of the lobbies use a fast start, meaning no chance qualify and at least get out in front of some of the chaos. Combine that with completely random luck in getting a car that has at least decent handling and a decent gearbox and it makes for not so much fun for me. And it's not about winning, I just like to race hard and fair, and I don't find much of that in shuffle lobbies. I find the PP system creates the potential for far more equal racing and I say potential meaning if some of the guys can tune and drive well, there is some very close racing.
There is no qualifying in shuffle racing. It is RGO only. Always.
That's the whole point of shuffle racing.
Indeed, the shuffle ratio setting can insure that the person who wins the previous race will wind up in the back of the starting grid with a slower car.
That's the point of shuffle racing, to mix things up, and give random people with random experience & speed, the chance for close racing together, without having to prepare cars or whatnot - you can just jump right in.
I have found a great many good clean shuffle rooms. But as in all pub lobbies, there's always one goofball out back who can't keep their car on the track no matter how good it is.

And there's occasionally a guy who has to be kicked.
There's a guy with the PSN name, Destinkeys who runs pretty clean shuffle lobbies.
I really enjoy getting difficult cars and seeing how well I can do with some bummer of a car. LOL Or get a good car, and actually have a chance against some of the guys who do this every night & are super fast in whatever shuffle car they get!!
Or to give some other guy a chance who's racing while he has a 5 year old screaming in his ear, to get a good car & come out ahead for once.
It's certainly NOT a place to find "fair" racing in the sense that it's a battle of who can choose & tune the best car for the PP and then race it well.
It's a challenge to deal with what you're given and do the best you can with what you're handed.
Certainly not everyone's cup of tea.
But I think it was a brilliant idea for the game.
I just wish it was a little more adjustable.
(Mostly I wish you could choose not to have any of those annoying 4wds come up.)